Title :
Flexible down-sampling using CIC filter with non-integer delay
Author :
Babic, Djordje ; Renfors, Markku
Author_Institution :
Inst. of Commun. Eng., Tampere Univ. of Technol., Finland
Abstract :
In this paper we present an efficient structure for flexible downsampling in multistandard radio receivers. It is based on Cascaded Integrator-Comb (CIC) filter that has very efficient implementation structure without multipliers. By using non-integer delay in the feed-forward branch of comb stage and polynomial interpolation filter between integrator and comb stages of CIC we achieve improved attenuation for the aliasing frequency components. The fractional delay that is placed in feed-forward branch of comb stage introduces some extra requirements for design and implementation. The main advantages of the proposed structure are flexibility and programmability
Keywords :
cascade networks; comb filters; delays; digital filters; feedforward; integrating circuits; interpolation; CIC filter; aliasing frequency components; cascaded integrator-comb filter; comb stage; feedforward branch; flexibility; flexible down-sampling; fractional delay; multistandard radio receivers; noninteger delay; polynomial interpolation filter; programmability; Attenuation; Delay; Digital filters; Feedforward systems; Frequency response; Hardware; Interpolation; Polynomials; Receivers; Sampling methods;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Conference_Location :
Phoenix-Scottsdale, AZ
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010980
